The finish on this socket is cadmium. Given Plomb is thought to have produced these during the war, and those would be cadmium plated, this socket should date frome early 1942 to mid 1945. Additionally, this socket has 2 lines of knurling, where the chrome plated examples tend to have 3.

The finish on this socket is Chrome. Given Plomb is thought to have produced these during the war, and those would be cadmium plated, this socket should date to just before OR just after the war. Additionally, this socket has 3 lines of knurling, where the cadmium plated examples tend to have only 2.